For the first time in the Mike Tomlin era, the Pittsburgh Steelers will have to find someone else to run their offense.Bruce Arians, who has been the offensive coordinator since Tomlin took over as head coach, will retire."I appreciate his efforts over the past five years as the teams offensive coordinator and for helping lead our offense to new heights during his time with the Steelers. I am grateful to Bruce for contributing to our success and wish him nothing but the best in his retirement," Tomlin said in a written statement.Arians was the wide receivers coach when Tomlin was hired in 2007 and promoted him to coordinator.He entered the NFL as a running backs coach for the Kansas City Chiefs in 1989 and served as Peyton Manning's first quarterback coach. His NFL resume also includes stints with the New Orleans Saints and Cleveland Browns.The Steelers' offense finished 21st in the NFL in scoring in 2011, mustering 325 points during the regular season, an average of 20.3 points per game.

PITTSBURGH —

For the first time in the Mike Tomlin era, the Pittsburgh Steelers will have to find someone else to run their offense.

Bruce Arians, who has been the offensive coordinator since Tomlin took over as head coach, will retire.

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"I appreciate his efforts over the past five years as the teams offensive coordinator and for helping lead our offense to new heights during his time with the Steelers. I am grateful to Bruce for contributing to our success and wish him nothing but the best in his retirement," Tomlin said in a written statement.

Arians was the wide receivers coach when Tomlin was hired in 2007 and promoted him to coordinator.

He entered the NFL as a running backs coach for the Kansas City Chiefs in 1989 and served as Peyton Manning's first quarterback coach. His NFL resume also includes stints with the New Orleans Saints and Cleveland Browns.

The Steelers' offense finished 21st in the NFL in scoring in 2011, mustering 325 points during the regular season, an average of 20.3 points per game.